Select accent pillows in a solid neutral, gray or black for a safe approach. Add damask-print pillows in red or black on a white background for a dramatic look. Create a casual look using two red bandannas sewn together for one large pillow. Use yellow and blue pillows to create a cheery look.
Drape a throw across the back of the red couch using your chosen accent color. Select tan, white or cream for a casual look, or make a dramatic statement with a cashmere black or gray throw.
Place an area rug beneath or in front of the sofa. Select an oriental rug with red as part of the design, and use one or two other colors from the rug as accent colors for accessories.
Choose a floor lamp with a silver base and white shade for a refined look.
Place a few worn books with covers in red or your accent color on the end table.
Hang a picture above the couch that includes red and your accent color.